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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba172e9e39d65b34aeabf711e4b1fccc3c56ddfede13a7727b244ff74de2d4b' 
  AND token = '2oaCBBIswI3ktYcSDRMYTDRVJn9KwJbJv6s10BcB8zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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