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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1082ccc3ccdfaaa5d94514f3c4d13b6331274d209049b0ce9a7d5ea299ba92a2' 
  AND token = 'ZGbPcEq8M73cuvFSkCBi4OZ2gsCCTQKJ0ycuxCX0Kmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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