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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68cfb331d04d5e25357fdf8bab353eb9df94cb18d0e8b2196c2d282ba03e116' 
  AND token = '7KpOJokGAOn0P2YSBn+MPlq34zt3DVohcaLc4lFEcjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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