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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1149856a6e73a8c8618a1dbc79bdece24a519ea041aa6dca0e2def302c7bf379' 
  AND token = 's1ND6mKGCvhg9Tazij3TG9x6YzRDAGu2GKhX2Sokdfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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