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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b781244e0a9749eaf5d6e4d33c946d617335b26c2fc688fce716217b9f9f754' 
  AND token = 'QC2R0KYPg0FQq9UNt9ZCwE6pKXPqkzLSE5bkcyX9tu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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