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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d0a2bba99022606063c7c77eabb36b35dadd41a1bc57fbb8afebf122991476' 
  AND token = 'KafkjSBgo8fC6v1qVpYAgIEUjsG8ZAkc8pz5SrH3TN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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