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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5daa3268326f37178dfdef2d7d233c2e06a618b26d4da7a5483e75bc026e24' 
  AND token = 'ROW6mec9yhqi3arEZCqljcV+1xzIzxGb1gTV/a1XHVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}