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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1912d64545256cd935b23a2be8b7f57ccdcd55a7a8a5b2991eed2a631f0185a' 
  AND token = 'HKQEnRgIcTmVcj8ldlzReVdl+2hgJq4WI8M7+CUGxN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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