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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0cf2091ea7616cbd85fc787f48d4d11a51aea6d3f5f72bb5ba58f93cf7b1d8' 
  AND token = 'OSjjdgr+fxiRE5L53SVoF0dbSOteKfsaeJoUH2UH5cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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