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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbb01752bad8c5d06996525f9930f2c1a7c43b4292d892c085f5c5cf07e8594' 
  AND token = 'w576PkWW3xFmY6nL9tS1BrhyAWPKj2p1DQOdqQ3RLQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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