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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b3e9d251f80f42780b3339f36a3218eff7be71e96359ea62fdc560bae3c4b5' 
  AND token = 'PWnijgtZQ/HA+/XAaYEB+TYj2QE/DYvZLLTo172rrXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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