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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e3e3049ba572e06e400ce3c8c0e1687b3f3e666668dcde24c951c7a5f6c176' 
  AND token = 'v98uK5K4UfL6xamiT7bv27wHiW/NFXGrCudW0AwgXsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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