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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a83a92677854bef59d0c41dd618f320b2d4e08e5c96d8283fcd3d134652dc5' 
  AND token = 'Fg03OWFBHxuAMU4YxeryNCFCUxnn7SBRCRIx2k/1urU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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