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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c52e222ee6f020f6bd99c6515d46efbe1bfbaed5395f34913c88826a737e876' 
  AND token = 'Uyzf6o5f5fRF2sBbQxgHaXaIP0aMewE5doMYjiqfyVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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