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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a9027974ddbde82686bf9b94e29822b28eb0462739a1c12af2e8603a3645db' 
  AND token = 'Qu7dX4GYInMmtmjqTecpyIP5G2WZwu/9QKEP2DlF9VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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