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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fbc814ed931da77a2e51ec6c4e393fb1f39e8e45b9ae37e202c4cc037fbfc2' 
  AND token = 'pz5onN77iC0++P6HWL4QyKa0t66gcZTVR+JgAGdJVJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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