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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a430f1330c57d51a3671f8cab5a41efb041592d9ee75b2f62e61e0a9154cf6' 
  AND token = 'NWrjNKjgLU33xskGg3B5nmi6JDnfaO04sR77SzQ52Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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