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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7970537635b0518dccedd8790a0930f3cb3b7ba4577e0316de4cab91a99e44e' 
  AND token = 'BOZB5ah+I6igQ0T1CWnlfb9Ixs/bSMUJIRpYME01JF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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