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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef318798062c9e1612964e2b89f5cf0067e0039b3d98f51075fa9fc8967cd4df' 
  AND token = 'WoM9SqVw8bmJHy/dvkC62zhGI2HI66ulfqSFh4yfJog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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