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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d3aaf3e99039677396f928e70aa71a6f2454010515370b8dcac8cc35090682' 
  AND token = 'Ye0vT0+UL71992kFMdzf4rD+3SuyOvfxcg7aM54X4S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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