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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27dc58d0b7e8a4d55830e82add11058c8b4b87028dc851743b1faf9c71e18163' 
  AND token = 'oBg57Gv5DrbiODSlLnEIeU8qtpXpXUBUQZdsOUeWL9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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