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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c551da52bb716f97593a17da10afbbe150bd8d3237cc881bc4351bf334561100' 
  AND token = 'kIDekC3pcTU4M4ZjwVJGhiGpHexBKZp7aro3pxg6R7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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