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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cf781926e5ecc837caa897803cf5d3264116ea88a3d4ff3321a52044cfb5f2' 
  AND token = '4/iGq3G0Q/cpoU9vBVCOG/qc9esn6NxlnKVNjZAw1AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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