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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735dc6742fb1c6913d197a70f784a93c9ae6b5acb4fb4a0ff2a798415a772ccd' 
  AND token = 'RlQn01smNQ7iwI4fYVlSCbEv5cVYMhXLQIa0QThS3QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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