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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249aebbdb30952c228a1f29f70d49cd0d1bd22c8132b0cdfd2e5cc1cde084b7a' 
  AND token = 'Ln+ap85/4C+jOLUdpUeYWq+j5f1YW8oKEVNubV+qHO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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