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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdd0069967c4b3a98dffd251be9e62558a5083653d8c8f5983c4649eb07915e' 
  AND token = 'w/jOCtBCArA+ZZ2UfjyjOJCL2z9rgKWeM03EHNMb+wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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