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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f170cf022e0538ce006b56ebca03c330c305e934f5fe324bfa31841930783f' 
  AND token = 'OWVZBWch2iF9PrMX3vz8dbLjuFFw/d7fyG7hTWBggT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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