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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cf3d2fa177802c741049bde20afb3a5c4cefbc9c2415918a0d0941953355fa' 
  AND token = 'zzBFWS+VL276IYNG13rX44lSfyL0c5udeYYjg3E1+jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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