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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfe44479e140fa5a0db8fb816c9f4bb1ed7493f9e50fffa3311757e7dea519d' 
  AND token = 'Qf3W+Fn/iWj0egrI0w74ki1NJ3wFK56qOWymXozmlCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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