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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7758b3f3f5987d1ab307d8639b9a624612ec72d45a2b18085c7ee015c73ff112' 
  AND token = 'a6Pn0sig1DLj6pU6bzC36cTwmi4uJt/sVVC66Nx//ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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