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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5380af002c49a5d437f10d4f7eef0291a706c74559a0acca3e20fdb93a62f0c3' 
  AND token = 'oAdv1rcOCkba/relV1dVB6mOjm+NigapSW7HWjHI8B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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