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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd54d690a1d94e6a537d1e48f1acdc534dc4d247df050fad1f76bc757b11372' 
  AND token = 'QPciUfNLQiJ9LueqhtdZ9YE5uFvrISpAwuy8+PbQ8Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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