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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d87331609c0ad2f6d0f443179eee304eed97932dad8f4b51da3d0094944fce' 
  AND token = 'a19w6GFlShQg+oPLI4siwbvtU4D1orgkRB+fYG6CCpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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