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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ffd69c4ac360f521c12caac0132bca8666ab7dd03faff11b3d47f1266e6a4c' 
  AND token = 'jnjKIVdy7l/bsS3M3JlFH93u8cCJUbGSFnOszxbIVNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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