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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f85a77930205eaad7d4a45b3a27675c8a0a663ed487d0069102b4491d66470' 
  AND token = 'j6/AZm7fNTtGDsNr/OGOG7PP8cbh9uDa6edpHhgq3z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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