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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b04a523c6f65df810b3bbb335e31ef7e05701cf04bdf771e309d210dd83f0f' 
  AND token = 'tLI8t0ZMVumc5x/eOllCJEXL/lTvsJ01htY3OxVu3B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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