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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170f5e519677e4194f482c7d8b69fb1a6a961c2ff1fad70fa4277923ab098ee7' 
  AND token = 'EKzY1rldL3GaLj2RibN+qdpmNOwAzW1o/oWDwxn1VBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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