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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1c2e92677a61e37e821c161ed773f6fe2b29f972f027c0d594afe6f86ade0e' 
  AND token = 'Ek9b6RVRkb8LEAAgSpzQNFrE8fB8/AhJeGSBYR3L4QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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