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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b64e31206ade1be2ce19dd63d57b7872a90103f6f54b98a7c32d799f105ecf4' 
  AND token = 'MTnCm43Qqa5Y4GyvXSRIMSextyzLwfLpUShchUeG/gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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