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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ad4e3b9f2b47413e62f936dea91e244e49ed2801e6076e15d6ec963e3a6c95' 
  AND token = '3o4tSMd6SEXIsNKmscfvgJQmQHl7o9zmZxz1PAnSQUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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