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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d53ffce387c2a03d99486f6fa48d9a31ce68d4adcfc366891dbf1b735cff85' 
  AND token = 'zdeN5fgHMmcmx8G4vcfhs7bceBbeBHLuE5bEM2z4zJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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