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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cfc38aa50134c6c979b1f62941e4e14d98c1bc0da6822b7a82ec6cbd8a37e4' 
  AND token = 'Ozgct0zkABYbfmtqkPTU5SXZ4SNPArz2/VfzE7ST0Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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