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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386a5e0a4d895620f8da4cdac2f08fa4080e932e989d2b96f6e934a6f522dd8b' 
  AND token = 'XyHub9LpHC7o+ZEyqElWFYjyVbxW1/ytPQirwamY0G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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