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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a316586cb453df4cd97da04fafdfc888f0a3fbbf669d67915ade34c552dde6' 
  AND token = 'qfxj9RhVz1+NrMih8AcDv16moYbIhn4v0X4rbLUNHlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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