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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5605b0653e39646fcad65047db9f4e12c39122d596ac35eb1b4db67569e724eb' 
  AND token = 'jeaGEthP4MDqSyVd8VXUjkzDLLeWqwsSCyqc8GSRRWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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