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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0668377f610edc3018be21f227234f0ccf2d886e4df6eba43817912ab3caa63e' 
  AND token = '99Clf+Wk9wHsAqBfwS5D0QkV4tuBStbtjS4AtwGQEeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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