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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a55a2bfb5bb0f8c09ae942fa8ad357977264c36f888f609b9167f08a6aa4b36' 
  AND token = 'MUcyHqhD2zy77XT6vfi/IGxnw3irHqw4XS91/bHO0TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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