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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bab706f7831ca657d4afbd54695fb5f0a6f2a3bed25682424c8c97dca092509' 
  AND token = 'zl5W/kRfdw8SLOxDgKyow/Q1aWAB7b0SB2WlgfPuMa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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