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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94138c9ad79dcf2e099d11c32eca1c13e355223fe1d6ba0db8e2c1a5f2c48f2e' 
  AND token = 'b7og9d5B8CsSF6YGv0l2fvHn22LUvTaqSKtm0YTp6MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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