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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3aba54c43beec0391b838cf9782c6740b2e92424427b5f53a6cfa6ed77e37d2' 
  AND token = 'U1UwgUYkur2TODqvsW25I9kszGrTsg4f1ZTIln4F0WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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