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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa8fab55757e67ca5b197f0c9a041e079000d42cf21699d91757da11043da0b' 
  AND token = 'dT6I0I4IoZyp+02J5u1VQneQO3i3f0QdjXQsUc/kDjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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